An update on interleukin-4 and its receptor.
Interleukin-4 (IL-4) exhibits many biological and immunoregulatory functions on B lymphocytes, monocytes, dendritic cells and fibroblasts. The IL-4 gene is located on chromosome 5 and displays several cell-specific regulatory sequences in its promoter, which explain its restricted secretion pattern to activated T cells and mast cells. The IL-4 receptor is multimeric and is constituted by at least IL-4Ralpha, a chain common to other cytokine receptors. Two types of IL-4 receptors have been defined: one constituted by the IL-4Ralpha and the gamma(c) chain, and a second constituted by the IL-4Ralpha and the IL-13Ralpha, which is able to transduce both IL-4 and IL-13 signals. Major events of IL-4 transducing signal have now been elucidated and are known to be mediated through JAK/IRS-2 and STAT6 pathways. Numerous studies have also demonstrated the key regulatory role of IL-4 in allergic responses as well as its anti-tumor and anti-inflammatory effects.
Chomarat
P
P
Baylor Institute for Immunology Research, Dallas, Texas 75246, USA.
Banchereau
J
J
D000818:Animals; D000938:Antigen-Presenting Cells; D001491:Basophils / Q000276:immunology; D005786:Gene Expression Regulation / Q000502:physiology*; D006801:Humans; D015847:Interleukin-4 / Q000235:genetics / Q000502:physiology*; D008213:Lymphocyte Activation; D008407:Mast Cells / Q000276:immunology; D019948:Receptors, Interleukin-4 / Q000502:physiology*; D013601:T-Lymphocytes / Q000276:immunology
D019948:Receptors, Interleukin-4; D015847:Interleukin-4